RECENT ADVANCES in DATA NETWORKS, COMMUNICATIONS, COMPUTERS

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RECENT ADVANCES in DATA NETWORKS,

COMMUNICATIONS, COMPUTERS

Proceedings of the 7th WSEAS International Conference on DATA NETWORKS, COMMUNICATIONS, COMPUTERS

(DNCOCO '08)

Bucharest, Romania, November 7-9, 2008

Recent Advances in Computer Engineering A Series of Reference Books and Textbooks

Published by WSEAS Press

www.wseas.org ISSN: 1790-5109

ISBN: 978-960-474-020-8

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RECENT ADVANCES in DATA NETWORKS,

COMMUNICATIONS, COMPUTERS

Proceedings of the 7th WSEAS International Conference on DATA NETWORKS, COMMUNICATIONS, COMPUTERS (DNCOCO '08)

Bucharest, Romania, November 7-9, 2008

Recent Advances in Computer Engineering A Series of Reference Books and Textbooks Published by WSEAS Press

www.wseas.org

All the copyright of the present book belongs to the World Scientific and Engineering Academy and Society Press. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of the Editor of World Scientific and Engineering Academy and Society Press.

All papers of the present volume were peer reviewed by two independent reviewers. Acceptance was granted when both reviewers' recommendations were positive.

See also: http://www.worldses.org/review/index.html

ISSN: 1790-5109

ISBN: 978-960-474-020-8

World Scientific and Engineering Academy and Society

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RECENT ADVANCES in DATA NETWORKS,

COMMUNICATIONS, COMPUTERS

Proceedings of the 7th WSEAS International Conference on DATA NETWORKS, COMMUNICATIONS, COMPUTERS

(DNCOCO '08)

Bucharest, Romania, November 7-9, 2008

Editors:

Prof. Mihaiela Iliescu, Politehnica University of Bucharest, Romania

Prof. Radu I. Munteanu, Rector of the Technical University of Cluj-Napoca, Romania Prof. Juan Frausto-Solis, Tecnologico de Monterrey, Campus Cuernavaca, Mexico Prof. Tudor Sireteanu, Romanian Academy of Science, Bucharest, Romania Prof. Ion Carstea, University of Craiova, Romania

Prof. Gabriella Bognar, University of Miskolc, Hungary Prof. Dana Simian, Lucian Blaga University of Sibiu, Romania Prof. Valeri Mladenov, Technical University of Sofia, Bulgaria Prof. Zdzislaw Wieckowski, Technical University of Lodz, Poland Prof. Nikos Mastorakis, Technical University of Sofia, Bulgaria and Milit.Inst.of University Education, HNA, Greece Dr. Luigi Vladareanu, Romanian Academy, Bucharest, Romania

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International Program Committee Members:

Adel Awad, SYRIA Aitor J. Garrido, SPAIN

Alexander Nikov, TRINIDAD AND TOBAGO Alireza Khorami, IRAN

Ana Rocha, PORTUGAL Andrea guerriero, ITALY

Antonios Hatziapostolou, GREECE Anupama CSS, INDIA

Azami Zaharim, MALAYSIA Azween Abdullah, MALAYSIA

Christian Posthoff, TRINIDAD AND TOBAGO Dan Selisteanu, ROMANIA

David Thambiratnam, AUSTRALIA Dorin Sendrescu, ROMANIA Edite Fernandes, PORTUGAL Emerson E. Costa, BRAZIL Emil Petre, ROMANIA

Gabrijela Leskovar-Špacapan, SLOVENIA Ghislain Franssens, BELGIUM

Habibullah Jamal, PAKISTAN Jayantrao Patil, INDIA

Julio Clempner, MEXICO Karabi Datta, UNITED STATES

Katarina Jegdic, UNITED STATES Kiran Sree Pokkuluri, INDIA Laila Elfangary, EGYPT

M.Fernanda Costa, PORTUGAL mahmoud Samiei nasr, IRAN Mahyar Arabani, IRAN Majda Bastic, SLOVENIA Manjula Tambakad, INDIA Mehdi Akhlaghi, IRAN

Miroslav Premrov, SLOVENIA

Mohammad Tariqul Islam, MALAYSIA Nagarani Ponakala, JAMAICA

Nenad Gubeljak, Croatia Paul Walcott, BARBADOS Philotheos Lokkas, GREECE

Plamen Simeonov, UNITED STATES Saeed-Reza Sabbagh-Yazdi, IRAN Sanjay Ganorkar, INDIA

Simon Silih, SLOVENIA Wang-Hsai Yang, TAIWAN Yannick Le Moullec, DENMARK

Zeljko Panian, CROATIA (HRVATSKA) Zhang Yimin, CHINA

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Preface

This book contains the proceedings of the 7th WSEAS International Conference on DATA NETWORKS, COMMUNICATIONS, COMPUTERS (DNCOCO '08) which was held in Bucharest, Romania, November 7-9, 2008. This conference aims to disseminate the latest research and applications in Network Architecture, Modelling and Simulation of Networks, Protocols and applications, Security Aspects, Wireless communications, Communications Switching and Routing and other relevant topics and applications.

The friendliness and openness of the WSEAS conferences, adds to their ability to grow by constantly attracting young researchers. The WSEAS Conferences attract a large number of well- established and leading researchers in various areas of Science and Engineering as you can see from http://www.wseas.org/reports. Your feedback encourages the society to go ahead as you can see in http://www.worldses.org/feedback.htm

The contents of this Book are also published in the CD-ROM Proceedings of the Conference.

Both will be sent to the WSEAS collaborating indices after the conference:

www.worldses.org/indexes

In addition, papers of this book are permanently available to all the scientific community via the WSEAS E-Library.

Expanded and enhanced versions of papers published in this conference proceedings are also going to be considered for possible publication in one of the WSEAS journals that participate in the major International Scientific Indices (Elsevier, Scopus, EI, ACM, Compendex, INSPEC, CSA .... see: www.worldses.org/indexes) these papers must be of high-quality (break-through work) and a new round of a very strict review will follow. (No additional fee will be required for the publication of the extended version in a journal). WSEAS has also collaboration with several other international publishers and all these excellent papers of this volume could be further improved, could be extended and could be enhanced for possible additional evaluation in one of the editions of these international publishers.

Finally, we cordially thank all the people of WSEAS for their efforts to maintain the high

scientific level of conferences, proceedings and journals.

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Plenary Lecture I

New Trends in Efficient Production and Distribution of Electrical Energy

Professor Mihai O. Popescu

Vice-Rector of the Politehnica University of Bucharest, ROMANIA

Email: mo_popescu@rectorat.pub.ro

Abstract: Electrical energy is absolutely necessary for an advanced society. In this context use of classical combustibles (coal, petroleum, nuclear) is limited, e.g. by sources exhaustion. Some other undesired phenomena are commented and the solution – use of renewable energies is discussed. At the European level strategic objectives are presented for each case, even the cost target for 2015. In the same time distribution of electrical energy is subject to modernization with intensive promotion of information technologies. Some new ideas are presented, related with numerical treatment of information in new systems with multiple and distributed sources.

Brief Biography of the Speaker: Professor Mihai O. Popescu (SM of IEEE) is graduated in Electrical Engineering in 1970, at the University Politehnica of Bucharest. His main activity topics are: transient phenomena in electrical network, switchgear, electrotechnologies, quality and reliability. He is author of more than 20 didactical manuals, more than 80 referred articles and 40 research contracts. Actually he is Vice-Rector of University Politehnica of Bucharest and member of National Quality Assessment Agency in Higher Education.

ISSN: 1790-5109 9 ISBN: 978-960-474-020-8

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Plenary Lecture II

Adaptive Wireless Access Solutions in Transport Systems Management Environment

Professor Tomas Zelinka Czech Technical University in Prague,

Technical Cybernetics CZECH REPUBLIC Email: jerabek@fd.cvut.cz

Abstract: This paper presents new attitude to adaptive control of the multi-path and multi-technology technology wireless access communications solutions. Presented approach is response on transport processes management requirements to provide complex seamless communication services in the selection of different modes coverage and guaranteed quality. Such solutions are related to communications of the vehicle to infrastructure as well as vehicle to vehicle. Such communications networking must include inter-vehicle communication interconnect, as well. CALM based system represent relevant data routing/switching with vertical RM OSI compatible communications architecture, however, with horizontal hierarchical management structure. Genuine decision processes in defined communications CALM routing/switching structures are, however, in literature discusses quite rarely. Decision processes measurable i.e. precisely enumerated system requirements are qualified by the performance indicators.

Based on application analysis performance indicators are demarcated into the acceptable tolerance ranges. In this paper we propose decision processes based on Bayes statistics as “classical” alternative to e.g. concept of Policy- based Management (PBM) traditionally and widely applied within the IP based networks. In proposed alternative measured data are processed by Kalman filters to separate reasonable part of noise and to predict individual parameters behavior in its near future. Than self-trained classification algorithm processes filtered measured data which are combined with deterministic parameters like the services economy, company policy etc. Training data block represent parameters vectors time line extended by correct decisions, i.e. appurtenance to appropriate class.

Even though these tools are designed specifically for the multi-path communications system, such principles are open for future penetration into whole telematic system adaptive management.

Brief Biography of the Speaker:

The Czech Technical University in Prague in “Technical Cybernetics”, PhD in experimental (geo-) physics at the Czech Academy of Sciences, Prof. (assoc.) in Informatics at Faculty of Transport Sciences of the CTU in Prague.

2005 - Czech Technical University in Prague

- Lectures: telecommunications sciences, legal issues of telecommunications regulation, new technology trends, telecommunications in ITS, business management, strategy planning, …

- R&D: new telecommunications trends and solutions within Intelligent Transport Systems, 1993 – 2005 Communications business

ISSN: 1790-5109 10 ISBN: 978-960-474-020-8

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- Development of new products, Strategy planning, Business development e.g.of alternative global voice and data communications in the Czech Republic and other countries of the CEE region – namely in Global One (Sprint Int., France Telecom, Deutsche Telekom)

1976 – 1994 Academy of Sciences

- Experimental laboratory and observatory methods in Geophysics - studies of the variations and drift of the Earth magnetic field, Data communication solutions within international and national observatory system,

- Computer modeling of magnetic material structures with on-line experimental identification – studies done on the artificial samples with well defined magnetic particles structure. Laboratory measurement of the magnetic properties of rocks,

1972 – 1976 Industrial R&D

- Automatic control systems for the technological processes - Computer Numerical Control (CNC), - Data communications and computer based control within technological processes,

ISSN: 1790-5109 11 ISBN: 978-960-474-020-8

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Plenary Lecture III

Triple Selection Diversity over Exponentially Correlated Nakagami-m Fading Channels Desired Signal and Cochannel Interference

Professor Dragana Krstic Department of Telecommunications Faculty of Electronic Engineering, University of Nis

Aleksandra Medvedeva 14, 18000 Nis SERBIA

Email: dragana@elfak.ni.ac.yu

Abstract: In this paper system performances of selection combining over correlated Nakagami-m channels are analyzed. Selection diversity based on the signal to interference ratio (SIR) is a very efficient technique that reduces fading and cochannel interference influence. Fading between the diversity branches and between interferers is correlated and Nakagami-m distributed with exponential correlation model. Very useful closed-form expressions for the output SIR’s probability density function (PDF), cumulative distribution function (CDF), and outage probability are obtained, which is main contribution of this paper.

Brief Biography of the Speaker: Dragana S. Krsti was born in Pirot, Serbia. She received the BSc, MSc and PhD degrees in electrical engineering from Faculty of Electronic Engineering, Department of Telecommunications, University of Niš, Serbia, in 1990, 1998 and 2006, respectively. Her field of interest includes telecommunications theory, optical communication systems, wireless communication systems, etc. She works at the Faculty of Electronic Engineering in Niš since 1990. She participated in more Projects which are supported by Serbian Ministry of Science. She has written or co-authored almost 90 papers, published to International/National Conferences and Journals.

WSEAS Activities:

Papers in WSEAS Conferences: Cambridge, UK, February 2008; Crete, July 2008; Bucharest, November 2008, and WSEAS Journal: WSEAS TRANSACTIONS on COMMUNICATIONS

ISSN: 1790-5109 12 ISBN: 978-960-474-020-8

RECENT ADVANCES in DATA NETWORKS, COMMUNICATIONS, COMPUTERS

RECENT ADVANCES in DATA NETWORKS,

COMMUNICATIONS, COMPUTERS

Proceedings of the 7th WSEAS International Conference on DATA NETWORKS, COMMUNICATIONS, COMPUTERS

(DNCOCO '08)

Bucharest, Romania, November 7-9, 2008

Recent Advances in Computer Engineering A Series of Reference Books and Textbooks

Published by WSEAS Press

www.wseas.org ISSN: 1790-5109

ISBN: 978-960-474-020-8

RECENT ADVANCES in DATA NETWORKS,

COMMUNICATIONS, COMPUTERS

Proceedings of the 7th WSEAS International Conference on DATA NETWORKS, COMMUNICATIONS, COMPUTERS (DNCOCO '08)

Bucharest, Romania, November 7-9, 2008

Recent Advances in Computer Engineering A Series of Reference Books and Textbooks Published by WSEAS Press

www.wseas.org

ISSN: 1790-5109

ISBN: 978-960-474-020-8

RECENT ADVANCES in DATA NETWORKS,

COMMUNICATIONS, COMPUTERS

Proceedings of the 7th WSEAS International Conference on DATA NETWORKS, COMMUNICATIONS, COMPUTERS

(DNCOCO '08)

Bucharest, Romania, November 7-9, 2008

Preface

The contents of this Book are also published in the CD-ROM Proceedings of the Conference.

Both will be sent to the WSEAS collaborating indices after the conference:

www.worldses.org/indexes

In addition, papers of this book are permanently available to all the scientific community via the WSEAS E-Library.

Finally, we cordially thank all the people of WSEAS for their efforts to maintain the high

scientific level of conferences, proceedings and journals.

Table of Contents

Plenary Lecture I

New Trends in Efficient Production and Distribution of Electrical Energy

Plenary Lecture II

Adaptive Wireless Access Solutions in Transport Systems Management Environment

Plenary Lecture III

Triple Selection Diversity over Exponentially Correlated Nakagami-m Fading Channels Desired Signal and Cochannel Interference